"I understand that they found some ammunition - maybe only one bit of ammunition on him - so that was enough to arrest him.
"He was then put into a police car, or more likely a police van with a cage for prisoners.
"But for some reason, I'm told he wasn't hand-cuffed.
"He was brought here to Croydon, and at around two o'clock this morning, he was taken into the custody suite and put into a holding cell which is normal procedure.
"At one point, the officer who died, opened the door to the cell to do two things.
"To get personal details of the suspect, but also to go through some COVID-19 procedures, which are mandatory for anybody who's brought into the custody suite.
"And it was at that point that the weapon was produced by the suspect and fired at the officer."
https://www.msn.com/en-gb/news/uknews/police-officer-shot-dead-by-man-who-was-being-detained-at-custody-centre/ar-BB19pn4A?li=BBoPWjQ